Charges properly
Pre-charge, bulk, absorb and terminate on the tail current, not on a gauge. Lead-acid floats; lithium stops, because a float only ages it.
ToolsMeasurement
Cycler
Battery cell cycle testing
Charge, rest, discharge and count amp-hours, with every decision made on the highest or lowest cell, because a pack with one weak cell is only as good as that cell.
- Latest
- 0.1.1
- Released
- 22 Sept 2026
- Licence
- MIT
What it does
Measures capacity
Cycle plans of charge, rest and discharge give the capacity you actually have against the pack’s rating, logged to CSV sample by sample.
Your BMS, charger and load
Pylontech, Seplos, Pace, Daly, JK, JBD, SOK and Renogy packs over serial or Bluetooth, OWON supplies and loads, an Atorch DL24, or a resistor bank.
No BMS at all
A lead-acid or bare pack works on pack voltage limits alone, with state of charge estimated until a capacity test has measured it.
Works with
PylontechSeplosDalyJKJBDOWONAtorch DL24
